Coal-cutting machinery



8 SheetsSheet 1.

' (No Model.)-

wyN. SYMI NGTON. GOAL CUTTING MAGHINBRY..

No. 413,796. Patented 001;. 29, 1889..

IIVVENTOR ATTOR/VEVJ WITNESSES:

"( Model a Sheets-Sheet s.

WLN. SYMINGTON. GOAL CUTTING MACHINERY.

N0.4;13,796. V Patented 0012.29.1889.

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UNITED STATES PATENT OFFICE.

WILLIAM N. SYMINGTION, or BROOKLYN, NEW YORK.

COAL-CUTTING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 413,796, dated October29, 1889.

Application filed June 5, 1889. $erial No. 313,188. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM N SYMING TON, a citizen of the UnitedStates, and a resident of Brooklyn, Kings county, New York,

have invented Improvements in Coal-Cutting Machinery, of which thefollowing is a specification.

The object of myinvention is to so construct a portable coal-cuttingmachine that when in use the coal-dust will not go into thepower-transmitting devices, and that consequently the machine will lastlonger and do its work better.

My invention also relates to certain improvements in the detailedconstruction of the transmitting devices and of the cutters.

In the accompanying drawings, Figure 1 is a longitudinal section of myimproved coalcutting machine. Fig. 2 is a sectional plan view. Fig. 3'isa vertical section, drawn to an enlarged scale, of the cutters mountedin the outer end of the carrying-arm. Fig. 4 is a corresponding planview, but with the top plate removed. Figs. 5 and 6 are correspondingviews of a modified form of cutter. Fig. 7 is a transverse section ofthe carrying-arm of the cutter on the line 1 2, Fig. 1. Fig. 8 is a sideview, partly in section, of a modifica- My invention relates to thatclass of coalcutters in which the machine is mounted upon a pair ofwheels and has a frame extending out in front of the wheels several feetand carrying at its outer end rotary cutters, while the opposite end ofthe frame carries the motor for driving the cutters.

Referring to Figs. 1 and 2, A Aare the pair of Wheels on which themachine is mounted, and B is the frame having the forwardly-extendingarm B, which carries at its outer end the pair of rotary cutters D D,while at the opposite end of the frame is shown the casing E for themotor for driving the rotary This motor maybe either a compressed-airmotor of any suitable construction or an electric motor, or any othermotor which may be found adapted for use in this I have, however,thought it 1111- necessary to illustrate the details of the motor, asthey form no part of my present invention. I need only here state that eis intended to representthe driving-sh aft of the motor, which, in theconstruction shown in Figs. 1 and 2, carries the flanged wheel or pulleyE for transmitting motion by means of an endless rope, belt, or band toa corresponding, but

smaller, flanged wheel or pulley F on the vertical axis f, which carriesthe two rotary cutters on the upper and lower sides of the carrying-armB. The endless rope, belt, or band, which may conveniently be a wirerope, is passed twice around each of these wheels. or pulleys E and F,and also once partially around a tightening-pulley G, mounted inbearingsin the adj ustable block H on guides h in the frame of themachine. This block, carrying the idler-pulley G, may be adjustedlongitudinally in the frame, to tighten the endless rope, belt, or band,by means of a longitudinal feed-screw S, adapted to turn in the fixedbearings sin the frame and having its end adapted to a correspondingopening in the block H.

While I prefer the described means of transmitting motion from the motorto the rotary cutters, I do not, however, wish to confine myself theretoin all cases, as other means may be used-such, for instance, as thelongitudinal shaft T, (shown in the modification, Fig. 8,) with abevel-pinion at its outer end gearing into a bevel-wheel F on the axis Fof the cutters. Whatever may be the means of transmission, however, itis an important feature of my invention that the entire frame B,especially the extended arm B, shall be in the form of a closed box orcase, which shall entirely surround and inclose the driving-gear and thewheel on the axis for the rotary cutters, this axis extending throughsuitable bearings in the outer end of the inclosing-frame, as shown morefully in Figs. 3 and 5. By thus constructing the frame in the form of aclosed box, as shown in Figs. 1, 2, and 7, the coal-dust, when themachine is in use, cannot get into and clog up the working parts, as isthe case in coal-cutters of ordinary construction, and in consequencethe machine will work for a much longer time without at IOC closed boxalso enables me to provide for the internal lubrication by pouring asupply of oil into the bottom of the inclosed case, and as the machineis tilted up and down more or less when in use this oil will find itsway to the diiferent bearings and avoid the necessity of lubricatingfrom outside.

I prefer in carryingout my invention to construct the cuttersin thedetailed mannerillustrated in Figs. 3 and 4. In this case each rotarycutter consists of a number of coal-cutting tools K, (three in this casebeing shown on each cutter,) fitting in corresponding recesses in thedisk A, which is keyed to the vertical axis f. The top plate k which isheld down on the disk by a nut 70' and by means of suitable bolts andnuts, holds the several cutters in place vertically, while they are heldlengthwise by ribs 2' on the top plates and the bottoms of the recessesfitting into corresponding notches in the edges of the cutters.

In the construction illustrated in Figs. 5 and G I have shown thecutting-tools with cutting-edges of a slightly-diiferent form from thoseshown in Fig. 4, and there are six tools on each cutter. In otherrespects the cutters in this modification are substantially like thosealready described.

I am aware that inclosed casings have been used in mining-machines withreciprocating drills and with angers, and I do not wish to be understoodas desiring to claim, broadly, the inclosing of operating mechanism inmining machinery; but

I claim as my invention- 1. A coal-cutting machine having a pair ofrotary cutters and driving mechanism therefor, and having the frame inthe form of a closed box entirely inclosing the driving mechanism, andan axis passing through the outer end of the box and carrying within thelatter a wheel to receive the driving-power, while on the outside theaxis carries the two rotary eutters.

2. The combination of the motor of a coaleutting machine with drivingmechanism and the frame in the form of a closed box inclosing the motorand the mechanism for transmitting motion from the motor, and an axispassing through the outer end of the box and carrying within the lattera wheel to receive the driving-power, while 011 the outside the axiscarries two rotary cutters.

3. The combination of a coal-cutting machine having its'entire frame inthe form of a closed box, a vertical driving-shaft, and pulley at oneend of the frame, with a vertical axis passing through the outer end ofthe frame and carrying within the latter apulley and carrying rotarycutters outside the rame, and an endless rope transmitting motion fromone pulley to the other, the said frame inclosing the rope and pulleys,all substantially as described.

4. The combination of the frame of a coalcutting machine having a motor,driving-shaft, and wheel, with a vertical axis having a central wheel, apair of rotary cutters, and an endless rope passed twice around both ofsaid wheels, and an adjustable idler-pulley around which the rope isalso passed, all substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two snhscribing witnesses.

\VILLIAM N. SYM ING'lON.

7 \V itnesses:

S. A. CHAMBERLIN, FRANK ROBERTS.

